Fire protection element having a woven carrier fabric

ABSTRACT

The invention relates to a fire-protection element ( 1 ), comprising: a carrier material ( 2 ) having a woven carrier fabric; an intumescent material ( 3 ), which is applied to at least one surface of the carrier material ( 2 ) and which forms elongate structures when heat is applied; wherein the carrier material ( 2 ) has a woven carrier fabric having loops ( 8 ) for receiving the elongate structures of the intumescent material ( 3 ) that arise when heat is applied and for hooking together with said elongate structures.

TECHNICAL FIELD

The invention relates to a fire-protection element having an intumescent material on a carrier material for sealing against heat and fire in the connecting area of construction elements, especially building components, such as walls, ceilings and floors.

TECHNICAL BACKGROUND

For fire partitioning and sealing against heat and fire, intumescent substances are inserted in the connecting area between construction elements, especially between building components such as ceilings, walls and floors. These substances frequently contain a carrier material comprising an incombustible material, on which the intumescent material is applied.

In order to achieve adequate flexibility of such a fire-protection element, frequently a fibrous material, woven fabric or roving is used as carrier material. However, the problem exists that, in the fire situation, the intumescent material separates from the carrier material due to the effect of temperature. Whereas, in the initial situation, the intumescent material is held on the carrier material by means of an adhesive, such as a polymer or the like, this decomposes at high temperatures, and so, upon a decline of the intumescent effect, which occurs upon the onsite of burnup of the carrier material and of the intumescent material, the expanded intumescent material separates from the carrier material.

This effect is frequently counteracted by mechanical devices, which in the fire situation hold the expanded intumescent material at the desired position.

From publication WO 2015/084739 A1, reinforcement of the intumescent material by a fabric mesh is known.

From publication EP 2 455 135 A2, a fire-protection element with a foamed body is known, which consists at least partly of an ash-forming and possibly intumescent substance mixture and at least one prefabricated thin and flat carrier component, which is bonded with at least one flat side to the foamed body. In particular, the carrier component may be a woven fabric or roving.

In the foregoing prior art, the carrier material serves merely as reinforcement, but due to the open mesh structure has only limited ability to guide the intumescence.

In publication DE 20 2012 001830 U1, an intumescent compound containing a glass-fiber mat or woven glass-fiber fabric is known that has a mesh width of at least 0.01 cm. Furthermore, the glass-fiber mat or the woven glass-fiber fabric may be disposed in such a way that, under the effect of heat and accompanied by formation of a carbon foam, it is able to form a bond between intumescent compound and carbon foam. Nevertheless, it cannot be expected that, after complete conversion, i.e. at the beginning of burnup, or of shrinkage, the glass-fiber layer and the intumescent layer will still adhere to one another.

From publication WO 2014/116791 A1, a woven fabric with a coating is known, wherein the coating contains a binder and an expandable graphite material and is applied on the woven fabric.

Publication DE 202 06 644 U1 discloses a fire-protection element for introduction into an open cross section of a hollow profile, wherein a fire-protection mass with mesh-like and flexible structure is bonded to the fire-protection element and is trapped by the fire-protection element.

Publication DE 297 22 652 U1 discloses a fire-protection mat comprising a wide-mesh woven glass-fiber fabric as carrier material and comprising a coating of a fire-protection compound that is applied on the woven glass-fiber fabric and that foams up to form a porous separating layer under the effect of fire.

The two last-mentioned publications respectively disclose a mesh that is equipped with an intumescent material, wherein the mesh represents merely a kind of reinforcement, by which the force of the intumescent action can be guided to only a limited extent in one direction.

It is the object of the present invention to provide an improved fire-protection element with an intumescent material applied on a carrier material, wherein an intumescent action occurring under the effect of fire is guided and wherein, during subsequent burnup of the intumescent material, this remains trapped by the carrier material.

DISCLOSURE OF THE INVENTION

This object is solved by the fire-protection element according to claim 1.

Further configurations are specified in the dependent claims.

According to one aspect, a fire-protection element is provided comprising:

-   -   a carrier material with a woven carrier fabric;     -   an intumescent material that is applied on at least one surface         of the carrier material and forms elongated structures under the         effect of heat:         wherein the carrier material is provided with a woven carrier         fabric having loops, in order to receive the elongated         structures of the intumescent material formed under the effect         of heat and to hook together therewith.

One idea of the foregoing fire-protection element consists in applying intumescent material onto a carrier material, which is designed as woven fabric material with loops, in which expandable-graphite structures formed by the effect of heat on the intumescent material can engage and hook. The expandable-graphite structures are elongated wormlike, usually slightly curved elongated structures, which are formed from graphite flakes in the intumescent material under the effect of heat. By adaptation of the intumescent material being used to the loop size of the woven fabric material, penetration of free ends of the expandable graphite structures into the loops of the woven fabric becomes possible, and so an improved bond is achieved between the woven fabric material and the expanded intumescent material.

The bond between the woven fabric material and the expanded intumescent material also has high resistance to a hose-stream test, which is an important aspect in the assessment of the fire-protection fitness of construction substances.

Furthermore, the intumescent material may contain graphite in a form that produces elongated expandable-graphite structures under the effect of heat.

It may be provided that the woven carrier fabric of the carrier material is designed as a knitted terry-loop fabric.

According to one embodiment, the loops may have an average cross-sectional area, such that the elongated structures of the intumescent material are able to engage in the loops.

In particular, the loops may have an average cross-sectional area that is 1.5 times larger, preferably 3 times larger than the average cross-sectional area of the elongated structures.

Furthermore, the carrier material may be equipped with a reinforcing layer, especially on a surface not covered with the intumescent material.

According to one embodiment, the carrier layer may be equipped with a fastening layer, especially an adhesive layer.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will be explained in more detail hereinafter on the basis of the attached drawings, wherein:

FIG. 1 shows a schematic diagram of a fire-protection element according to one embodiment;

FIGS. 2a and 2b show a schematic diagram of a yarn of woven glass-fiber fabric with loops and an enlarged photographic picture of such a yarn;

FIG. 3 shows a schematic diagram of the mode of action of improved adhesion between the carrier material and the intumescent material in the fire situation; and

FIG. 4 shows a schematic diagram of a further fire-protection element according to a further embodiment.

DESCRIPTION OF EMBODIMENTS

FIG. 1 shows a schematic diagram of fire-protection element 1 according to one embodiment of the present invention. Fire-protection element 1 has a substantially flat carrier material 2, on which a layer of intumescent material 3 is applied. Carrier material 2 is formed with a woven carrier fabric of woven fabric material and, at least on the surface turned toward the intumescent material, has loops with large cross section.

The woven carrier fabric is preferably formed from a fire-resistant material, such as from glass-fiber material, for example. The woven carrier fabric of glass-fiber material is manufactured by means of a glass-fiber yarn that has a series of loose loops, as is shown schematically in FIG. 2a , for example, and in a photographic picture in FIG. 2b . This glass yarn 5 has a bundle of one or more base filaments 51 and a large number of loop filaments 52, which loosely surround the base-filament bundle and thus form loops of various cross sections.

From such a glass-fiber yarn 5, it is now possible to form a woven glass-fiber fabric as the woven carrier fabric, which substantially has a structure as is known from terry-loop fabric, which is known in itself. Possible woven fabrics that may be used as woven carrier fabric 2 are, for example, THS Loomstate, E-Glass Glove with a weight per unit area of 430 g/m2 as well as HK© Thermo-E-Glasgewebe PG410 Frottee.

FIG. 3 illustrates a detail of fire-protection element 1, which schematically represents a boundary face 6 between intumescent material 3 and carrier material 2 after the action of heat. The expanded intumescent material has expandable-graphite structures 7, which stretch out in wormlike elongated manner and have been formed under the effect of heat from graphite flakes common for intumescent materials. The carrier material has loops 8 at its surface. At the boundary face 6 between intumescent material 3 and carrier material 2, the formed expandable-graphite structure 7 are able to extend into the loops of woven carrier material 2 and become hooked there. The expandable-graphite structures 7 of the expanded intumescent material 3 also engage with one another, and so both a cohesive intumescent material 3 and improved adhesion of the expanded intumescent material 3 in the loops of the carrier material 2 are achieved.

In contrast to conventional fire-protection elements of this type, this effect is also preserved at the beginning of burnup of the intumescent material 3, and so falling-off of the resulting ash crust is reduced or completely suppressed.

The size and geometry of the graphite flakes for intumescent material 3 are chosen such that the average cross-sectional area of loops 8 of the woven carrier fabric of carrier material 2 is larger than the average cross-sectional area of the elongated expandable-graphite structures 7, and so these can be hooked in sufficiently high proportion into loops 8. As an example, this is achieved by the fact that the average cross-sectional area of loops 8 is larger than the cross-sectional area of expandable-graphite structures 7 being formed, preferably at least larger than 1.5 times the cross-sectional area of expandable-graphite structures 7 being formed.

As illustrated in FIG. 4, the carrier material may be equipped with a reinforcing layer 9 on a surface turned away from intumescent material 3, in order to achieve improved stability of fire-protection element 1 and in the fire situation to achieve a guided intumescent action in the direction of the side turned toward the intumescent material 3. Alternatively or additionally, a fastening layer 10 in the form of an adhesive layer or the like may also be formed on the surface of carrier material 3 turned away from intumescent material 3.

In the mounted condition, carrier material 2 may also function as a housing, in order to achieve, in the fire situation, a guided intumescent action in the direction of the interior of the housing. Thereby, when the fire-protection element is disposed around a pipe, for example, or the like, the intumescent action can be guided in the direction of the pipe.

LIST OF REFERENCE SYMBOLS

-   1 Fire-protection element -   2 Carrier material -   3 Intumescent material -   5 Glass-fiber yarn -   51 Base filament -   52 Loop filament -   6 Boundary surface -   7 Expandable-graphite structures -   8 Loops -   9 Reinforcing layer -   10 Fastening layer 

1: A fire-protection element, comprising: a carrier material with a woven carrier fabric; an intumescent material that is applied on at least one s face of the carrier material and forms elongated structures under an effect of heat; wherein the carrier material is provided with a woven carrier fabric having loops, in order to receive the elongated structures of the intumescent material formed under the effect of heat and to hook together therewith. 2: The fire-protection element according to claim 1, wherein the intumescent material comprises graphite in a form that produces elongated expandable-graphite structures under the effect of heat. 3: The fire-protection element according to claim 1, wherein the woven carrier fabric of the carrier material is a knitted terry-loop fabric. 4: The fire-protection element according to claim 1, wherein at least some of the loops jut out from the carrier material in a direction of the intumescent material. 5: The fire-protection element according to claim 1, wherein the loops have an average cross-sectional area, such that the elongated structures of the intumescent material are able to engage in the loops. 6: The fire-protection element according to claim 5, wherein the loops have an average cross-sectional area that is 1.5 times larger than the average cross-sectional area of the elongated structures. 7: The fire-protection element according to claim 1, wherein the carrier material is equipped with a reinforcing layer. 8: The fire-protection element according to claim 1, wherein the carrier material is equipped with a fastening layer. 